The Hickok Open Top 3.5 .38SP - Although it appears to be a conversion the 1871-72 Open Top model was Colts first revolver specifically manufactured to fire a centerfire cartridge by incorporating the loading gate in the frame. Since Colt did not use percussion revolver parts the revolver was manufactured as an entirely new model first with Navy-sized grips later with Army-sized grips. The Hickok model is a modern twist on the classic Open Top that features a snub nose barrel. This model features a case-hardened forged steel frame round barrel with front blade sight no ejector rod blued steel grip parts an Army-sized walnut grip and a rear sight notch on the rear of the barrel.